CA2092427A1 - Chemical flow stream separator - Google Patents
Chemical flow stream separatorInfo
- Publication number
- CA2092427A1 CA2092427A1 CA002092427A CA2092427A CA2092427A1 CA 2092427 A1 CA2092427 A1 CA 2092427A1 CA 002092427 A CA002092427 A CA 002092427A CA 2092427 A CA2092427 A CA 2092427A CA 2092427 A1 CA2092427 A1 CA 2092427A1
- Authority
- CA
- Canada
- Prior art keywords
- passageways
- flow
- separator
- plural
- cleaning medium
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
- B29B7/00—Mixing; Kneading
- B29B7/74—Mixing; Kneading using other mixers or combinations of mixers, e.g. of dissimilar mixers ; Plant
- B29B7/7438—Mixing guns, i.e. hand-held mixing units having dispensing means
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
- B29B7/00—Mixing; Kneading
- B29B7/74—Mixing; Kneading using other mixers or combinations of mixers, e.g. of dissimilar mixers ; Plant
- B29B7/7404—Mixing devices specially adapted for foamable substances
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Nozzles (AREA)
- Polyurethanes Or Polyureas (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
An improved plural component dispensing apparatus having a chemical flow stream separator to ensure separation of the isocyanate and polyol plural components is disclosed to permit solventless operation and the cleaning by an aqueous cleaning medium followed by a gaseous drying purge stream to prevent the reaction of water and the isocyanate component.
An improved plural component dispensing apparatus having a chemical flow stream separator to ensure separation of the isocyanate and polyol plural components is disclosed to permit solventless operation and the cleaning by an aqueous cleaning medium followed by a gaseous drying purge stream to prevent the reaction of water and the isocyanate component.
Description
9 2 ~ 2 7 The present anvention relates generally to apparatus used to dispen~e a plurality o~ liquids throu~h a ~i~gle orifics, ,and more particularly it rel~tes to an insert used in a pol~urethane foam dispenser to separate the plural polyurethane foam mi~
components from each other in the dispenser a~d to permit water flushing to ~occur to obtain a foam di~penser that may be utili,~ed without the need for ~olvent cleaning.
Polyurethane ~oams are ormed by the reaction of an isocyanate component and hydroxyl-bearing compounds.
When mixed in the presence of a catalyst, a surfac~ant, and a blowing agent, these chemicals react to form cellular cross-linked polymer chains, more co~monly k~own as a polyurethane ~oam. Each o th~se components of the plural component ~aterial, by itself, is generally stable. Thus, each component will not cure or cross-link for eztended periods of time, often as long as several months, if they are properly stored.
~owever, when the iso~yanate component and the polyol compon nt, a pr~formulated co~pound that includes a surfactant,a catalyst and a bl~wing a~ent, are mixed together in proper proportions, en e~othermic chemical reaction of the isocyanate and polyol occurs. This reaction causes a co~inued expansion that is evidence : of the polymerization and manifests itself as foam which cross-links and cures. The cross-linking and curing usually is substantially completed in a matter of seconds.
Polyurethane foam dispensers are well known and have achieYe~d a hi~h degree of usage in insulating or ;~ packaging applications. Their use is particularly .: . ,, , '/ ' ' ' ' ' ' ' ~ ' ' '. . ' ' ' ' ' ~ " . ! :~ . , : ~' ',' , ' : ' :
,:
components from each other in the dispenser a~d to permit water flushing to ~occur to obtain a foam di~penser that may be utili,~ed without the need for ~olvent cleaning.
Polyurethane ~oams are ormed by the reaction of an isocyanate component and hydroxyl-bearing compounds.
When mixed in the presence of a catalyst, a surfac~ant, and a blowing agent, these chemicals react to form cellular cross-linked polymer chains, more co~monly k~own as a polyurethane ~oam. Each o th~se components of the plural component ~aterial, by itself, is generally stable. Thus, each component will not cure or cross-link for eztended periods of time, often as long as several months, if they are properly stored.
~owever, when the iso~yanate component and the polyol compon nt, a pr~formulated co~pound that includes a surfactant,a catalyst and a bl~wing a~ent, are mixed together in proper proportions, en e~othermic chemical reaction of the isocyanate and polyol occurs. This reaction causes a co~inued expansion that is evidence : of the polymerization and manifests itself as foam which cross-links and cures. The cross-linking and curing usually is substantially completed in a matter of seconds.
Polyurethane foam dispensers are well known and have achieYe~d a hi~h degree of usage in insulating or ;~ packaging applications. Their use is particularly .: . ,, , '/ ' ' ' ' ' ' ' ~ ' ' '. . ' ' ' ' ' ~ " . ! :~ . , : ~' ',' , ' : ' :
,:
2 209~2~
widespread in the boat manufacturing industry, where foam is used to enhance the buoyancy of the watercraft and in the refrigeration indust~y, where foam is used to insulate cooling compartments such ~s refrigerators, S freezers and large reriger~ted- railroad tank cars or highway trucks. This type of a manufacturing appl~cation requires ~ low density oa~ that can be dispensed by apparatus. One of the problems with foam dispensing equipm~nt used in th~ marine and refrigeration industries involves the need to obtain a fully e~panded low d~n~ity foam that does not readily cure within the ~ispenser or after curi~g reguire solvent ~l~aning. This latter con~ider~tion is becoming a more compelling need becau~e of the hazardous chemicals employed as ~olvents, concern with environment~l pollution and imminent strict governmental regulations in this area.
Prior oam dispensing apparatus has e~ployed either an air purging~ sol~ent purging or flu~hing, mechanical purging su~h as with a rod optionally fitt~d with a surrounding scr~per, or a combination o these approaches in order to obtain plural component foam dispensing apparatus with sufficiently long operating times before reguir~ng cleaning or replacement of internally clogged components. Typical e~amples of devices utilizing such systems include those disclosed in U.S. Patent Nos. 3,263,928; 4,377,256; ~,469,251;
4,534,802; 4,568,003 and 4,867,346. Howeve~, these devices do not always yield the desired length of operating time without internal clogging with cured foam or utilize undesirable solvent to obtain the reguired and desired operating time.
~ ecent approaches have incorporated the concept of keeping the flow of plural polyurethane foam components separate with:ln the dispenser until the streams enter a separate mi~cing ch~mber to pre~ent the reactive impingement mi~fing Of the o~m components f rom occurring within the dispenser and ~::logging the internal f low passages within the apparatus with cuxed 5 or set ~oam. U.S. Pat~snt No. 4"913,317 disclo~;es one ~ppar~tus ~hat h~s taken such an approach with the use of a ce~tral plug. However, thi~ approach still h~s the pot~tial or clogging :;inc~ it uses a compressed g~s purge thst has proven i.ne ective in the past to preve~t the buildup of fo~m without the use of a solvent.
Additionally the use of an aqueous medium to flush a dispe~ing app~ratus heretofore has no~ been ~ucc~ssul bec~use r~3idual water re~cts with the isocy~nate component and dama~e~ the u~it.
These proble~s are solved in the design of the pres~nt invention by providing an improved insert within a plural compon~nt dispe~sin~ apparatus that serves to separat~ the ~low streams of plural uretha~e ~ foam compone~ts and permits thP 10w o wat~r through separate ports in the insert to ~lush from the dispensing apparatus any residual compone~ts or reac~ed components that haYe formed ur@thane foam.
It is an object of the present invention to provide an improved insert in a plural component polyurethane foam dispenser that separates the component flow streams and permits flushing of the dispenser with an aqueous medium.
It is another object of the present invention to pro~ide an improved solventless plural component polyurethane ~oam componsnt dispenser that c~n operate for long periods of time without clogging.
It is a feature of the present invention that the improved chemical flow stream separator employg 20~2~27 separate passages for the ~low of an aqueous rnedium for each plural component to permit the flushing of the apparatus after use.
It is another feature of thle present invention that S each separate aqueous medlum flbw passage feeds into a corresponding plural compo~ent flow passage to flush the polyurethane flow Component ~low passages a~ter u~e.
It is still ano~her feature of the present in~ention that a compressed ~ir infeed is provided into each aqueous flush flow passa~e to dry any re~idual water remaining in the passages after flushing.
It is yet another featur~ of the pre~ent invention that the chemical 10w ~tream sap~rator and the mi~ing chamber are an integral component that is disposable.
It is an advant~ge of the present invention that a low cost and reliable solventless foam dispenser is obtained.
It iS another advantage of the present invention that the improved ~hemical flow stream separ~tor is simple ~n design and easily replaceable.
It is further ad~antage of the pr~sent invention that a well miged urethane foam is obtained at low pressure operatio~ by the use of the chemical flow stream separator.
It is yet another advantage of the present invention that the handling of hazardous solvent chemicals is avoided by the use of the improved chemical flow stream separator.
It is still another advantage of the present invention that a well mixed urethane foam is obtained by the use of the improved chemical flow stream separator in a foam dispenser that does not utilize solvent for cleaning.
These and other objects, features and inventions are obtained in the improved polyurethane foam plural component flow stream separator of the present - ~92~7 invention employed in conjunction with a foam dispensing apparatus whe:rein an easily removable insert is provided in the foam dispenser blvck with separate plural component f low passages that are separate unti 1 ~he f low of co~porle~ts is joined in a ~inqvle stream within an integral misinS~ chamber . I:ach plur~ 1 component 10w passage has a corre~pon~ling f lush passage th~t del;vers an ~ueo~ f lu~hing medium to the plur~l compoDent f low pas5ages af t~r u~e to clean ~ny residual fo~m compotlents or mi:Iced oam f rc1m the internal passageways of the disperl~er.
The adv~ntages of this inYen'cio~ will ~ecome apparent upon consid0r~tion of the ollowialg d~tai 1~
d~scription of the inverltion, especially when it is tal~en :1n conjunction witb the accompanying drawings wherea~:
Fig. 1 is a perspectiYe view of a oam dispensing apparatus employing the improved chemical f low stream separator of the present invention;
Fig. 2 i~ a bottom plan view of th~ improYed chemical f low stream separator of the pre~nt invention showing the separator inserted within ~he gurl blork of the dispenser;
Fig. 3 is a side eleva'cional view of the improved chemical flc~w stream separator o the present invention inserted within the gurl block of Figure 2 showing the aqueous medium flush activatil~ lever; and Fig. 4 is a rear ele~rational view of the improved chemieal f low stream separator of the present invention ~howing the water f lush irllets through which the flushing aqueous medium initially enters the s~parator.
Figure 1 shows in a perspectiv~ view the f oam dispen~er, indic:ated generally by the numeral 10. As seen in thi.s view, dispenser 10 has a gun manifold or block 11 w;th a nozzle to which is attached a static ~ ~3 ~ 2 7 6~
mixer (not shown). A pneumatic cylindler 12 is shown attached to the rear of the gun b10ck 11. ~n electri.c solenoid va1ve 14 connects to the cy1inder 12 to control the flow of pr,essurized air to the cylinder 12, S whose piston (not shown) drive~ the raick 15 of the rotary gear va1ve assembly 16 to turn the gears li8 to control the synchronous flow of plura7 compon~nts into the improved chemical flow s~parator ~not shown) ~ithin the gun bloi~k 11. An e1ectric trigger (not shown) is connected to 3 handle 17 to control the f10w of air into the cy1inder 1~ an~, henc~eO the f10w of plural compo~ents through the dispenser 10.
A1so seen in ~igure 1 is the isocyanate ~ side feie~
line 19 with couplings 56 and the po1yo1 ~ side feed line 20 with coup1ings 58 (partially ~isible). An air supply line 21 is shown to the rear of the manifold 11 with connections eeding the so1enoid va1ve 14 and the drying air P~ed line 22 from air li~e 59 and the three way pipe tee or coupling 2~, resp~ctively. Thle solenoid va1ve, upon ~ctivatio~ by the e1ectric trigger (not shown~, permits pressuriz~d gas to flow rom the air feed pipe tee 23 to th~ cylinder 12 to cause movement of the piston within ~ylinder 12 to thereby control the moveme~t of the rack 15 and the rotation of the rotary gear va1ve assemb1y 16. As the rack 15 synchronous1y causes the gears 18 of gear valve assembly 16 to rotatie, the flow of the isocyanate and po1yo1 compon~nts into the ch,emical f10w s~parator 2B
of FIG. 2 is controlled through the rotary va1ves 25 and 26 into inlet orifices 29 and 31 in opposing sides of the separator 28. When the rot,ry va1ves 25 and 26 are in the opien position for the flow of the plural components, the isocyanate component flows from the feed line 19 into the isocyanate interna1 passage 30 and the polyol component f10ws from the feed line 20 into the polyol internal passage 32 within the separator 28.
_7_ ~V~2~27 The air supply line 21 di~fides at air feed pipe tee 23 to supply pre~surized gas to the previously described cylinder 12 and solenoid valve 14 and on demand to feed through control valve 39 in'co the rear 5 of manifold or ~un block 11 tia coupling Z4 p~ior to fe~dline ~2. ~eedline 22 fe~d~ into a ~it~ing 35 tha~
is threadingly fastened to the back of block ll where ontinued acces~ into the b:lock ll is controlled by rotating valYe 36. Valve 36 is controlled in its l~ rotational ~ovement betwee~ open and closed positions by the rotation of lever 38 albout the mounting of scre~
61, best seen in FIGS. Z a~d 3. The lever 38 is keyed to the valve 36 and can have a washer betw~en it and the gun block 11. Valve 3~ is s~cure~ for rotational movement on its opposing side by an appropriate means, such as a snap ring, A set screw 33 can also be used with screw 61, which in combi~ation with appropriate O-ring seals, mak~s the valve chamber 39 fluid-tight.
Th0 set screw 33 i~ pl~ce~ within a tapped hole of about l~2 incb, for e~ample, so ~hat i~ i5 fully tightened within the gun block ll ~nd secured against further rotation. In he closed position valve 36 ser~es as a check valve.
Reerring again to FIGo 1~ an aqueous cleaning medium also flows into the gun block 11 via the same feedline 22 by the closing of th~ manual air control val~e 34 on air supply li~e 21 and the opening of the manual aqueous cle~ning medium control valve 40. This allows an aqueous cleaning medium, such as 50apy water, 30 to flow from th~ aqueous cleaning medium feed line 37 through the control valve 40 into the coup1ing 2~ and the f~edline 22 and then into the rear of gun block 11 through the f itting 35 . In the cleaning mode of operation~ best understood by viewing FIG. 2, the 35 aqueous cleaning medium flows first through the fitting ~n-35 and into the cl~aning passage 43 when the rot~ting valve 36 is in the open position. The medium then passes into the isocyanate and polyol internal gun block feed passages 41 and 42 via the valve 36 from where it enters the rear of the separator 2B throu~h the orifices 4~ and 45 th2t are within annular seali~g recesses 54 and 55 (see briefly ~I5. 4). Reces~es 54 and 55 a~commod3~e appr~pri~te sealing devices, surh as o-rings, conn~cting orifices ~4 and 45 to the isocyanate and polyol feed passa~es ~1 and 42 to eff~ct a li~uid-ti~hti seal ag~inst t~he separator 28. The aqueous cleaning medium then p~sses through the pass~ges 4l ~nd 42 into the internal cleaning and drying passages 46 a~d 48 of the sep~rator 28 and out through outlet port 49 in each of the recessed op~ning~
27 in the s;de or periphery of the separator ~8 adjacent the i~ocyanate infeed orifice 29 and the polyol infeed orifice 31. This permi~s the aqueous cleaning medium to clean the portion of the rot~ry valves 25 and 26 e~posed to the isocyanate and polyol infeed orifices 29 and 31, resp~ctively, and then flow back into the interior of eparator 28 through orific~s 29 and 31 into the isocyana~e ~nd polyol internal feed passages 30 and 32, respectively.
It should be noted that the isocyanate and polyol infeed orifi~es 29 and 31 are sized to the desired dispenser 10 output to control the back pr~ssure of the components upstream of the orific~s 29- and 31 to prevent premature frothing.
As is best seen in FIG. 2, internal feed passages 30 and 32 are angled from the rear to the front of the separator 28 so that they join together in a mi~ing chamber 50 at the very front of the separator 28 in a section that is of smaller diameter than the rear section of the separator 28. These separate feed passages 30 and 32 within the separator or stream 9 ~ 2 ~ 2 7 splitter 2B th~t is inserted i~to the yun block ll keeps the isocyanate A side and polyol ~ side components separated until they enter the mi~ing chamber 50 within the nozzle Sl of the separator 28.
It is at this junction in the mixin~ chamber 50 that the isocyanat~ ~nd polyol components react by impingement mising and e~it the disp~nser lO i~to the stati~ miser (not shown~ that i astened to the gun block ll by the adapter fittin~ 13 of FIG.l. Th~
combined componen~s are fur1:her mixed in the static mi~er tubular housing with :its mi~ing elements (both not shown9. A fluid-tight seal is ef~ect~d b~twee~ the static mi~er and the nozzle portion 51 with its mixing chamber 50 ~y appropriate means, such as o-ring3.
The chemical flow stream sep~rator 28 its as an insert within a hollowed-out openi~g 53 in gun block ll, partially seen in FIGS. 2 and 3, so that the entire rear portion of the separator 28 and about one ~uarter of the nozzle 51 is seated within the gun block ll.
The remaining portion of the no~zle 51 e~tends out of the ront of the gun block ll and fits within the adapter fitting 13 ~nd the static ~i~er (not shown~.
The hollowed out opening 53 is machlned out within the gun block ll and has tapered threads 52 at its f ront to ~5 secure the adapter fitting 13 and the static mi~er (not shown). An adaptor and tighten down nut (also not shown~ through which the tubular housing of the static mi~er e~tends, may be utilized to s curely fasten the static mi~er to the adaptor fitting 13 on the manifold or gun block ll.
It is to be understood that this type of a portable or on-site polyurethane foam dispenser lO is part of a foam generating system that usually comprises two storage tanks for supplying the two inter-reactiYe polyurethane-forming materials which are the isocyanate -lo - ~ ~ 9 2 ~ 2 ~
and polyol components. A gas pressl~re supQlying system is provided to pressurize these tanks to e~pel or force the reactants out therefrom through bulk flo~ supply lines that connect via the coup:lings 56 and 5a of FIG.
S 1 to the feed lines 19 a~d 20 of the dispenser 10. A
typical foam di~penser corresponding to dispen~er 10 is shown and described in V.S. Patent No. 4,073,664~
The static mi~er with its internal mi~ing elements may be of any suit~ble, such as that descrihed in U.S.
Patent No. 4,850,705.
In operati-on, the dispens~!r 10 is ~c vated by depression of the trigger switch ~not shown~ on th~
handle 17 which allows air to activate the air cylinder 12 and force the cylinder rod (not shown~ to cause the rack 15 to move the gear 18 to the open position, thereby rotating the rotary valves 25 and 26. This permits the pressurized isocyanate A component and the polyol B component to flow through the eed lines 19 and 20 into the gun ~lock 11 via the i~ocyanate and polyol in~eed oriic~s 29 and 30 in the separator 28.
The flow streams uf the isoc~anate ~ and the polyol B
components are kept separate within the separator 28 by passing through the angled isocyanate and polyol infeed passages 30 and 3~ until routed into the mi~ing chamber so within t~e nozzle 51. The isocyanate A and the polyol B components are then combined and f ed under pressure into the static mi~er tube or further mixing and dispensing a~ the finished product.
During the oam dispensing operation the manual air control flow val~e 34 and the manual ~queous cleaning medium flow control valve 40 have been in the closed positions. When it is necessary to clean the dispenser after the foam dispensing operation, the aqueous cleaning medium flow control valve 40 is opened to permit the cleaning and purging liquid medium, ~ ~ r~
preferably soapy water, to flow tnrough the aq~leous cleaning medium eed line 37 and th4 coupling 2~ i~to the gun block feedline 22. The aqueous cleaning medium then flows into the gun block 11 through the fittiny 35 and the cleanin~ passage 43. Valve 36 is opened by depre~sing lever 38 to perm:it the cleaning medium to . flow into the isocyanate ancl polyol cleaning passages 41 and 42, resp~ctively. The cleaning medium then passes into the separator 28 Yia the internal cleaning lo and drying ~assages 46 and 4IB. The cleaning medium is momentarily routed out ot the separator 28 through th~
outlet ports 99 to clean the exposed portions of the closed rotary valves ~5 and 26 and then reenters the separator 28 through the isocyanate and pslyol infeed orifices 29 and 31, respectively. The cleaning m~dium then passes through the isocyanate and polyol internal infeed pas~ages 30 a~d 32 to flush a~y residual fo m components th~refrom into the mi~ing chamber 50. The cleaning medium can then be dirested through the static mi~er, or the static mi~er csn be detached from the dispenser 10 and cleaned separately or discarded, as may be appropriate.
After the aqueous cleaning medium has completed the flushing of the dispenser 10, any r~sidual medium must be removed to preclude reaction with the foam components upon operation of the oam dispenser. This is accomplisbed by the shutting of the agueous, medium control valve 40 and the openin~ of the air control valve 3~, simultaneously with the continued d~pression of the valve lever 38, to permit drying air to follow the same route as the aqueous cleaning medium within the gun block 11 and the separator 28. The drying air, or other appropriate gas, is fed from the supply line 21 into the gun block 11 via the coupling 24 and the fitting 35.
Having thus described the invention, what is claimed is:
widespread in the boat manufacturing industry, where foam is used to enhance the buoyancy of the watercraft and in the refrigeration indust~y, where foam is used to insulate cooling compartments such ~s refrigerators, S freezers and large reriger~ted- railroad tank cars or highway trucks. This type of a manufacturing appl~cation requires ~ low density oa~ that can be dispensed by apparatus. One of the problems with foam dispensing equipm~nt used in th~ marine and refrigeration industries involves the need to obtain a fully e~panded low d~n~ity foam that does not readily cure within the ~ispenser or after curi~g reguire solvent ~l~aning. This latter con~ider~tion is becoming a more compelling need becau~e of the hazardous chemicals employed as ~olvents, concern with environment~l pollution and imminent strict governmental regulations in this area.
Prior oam dispensing apparatus has e~ployed either an air purging~ sol~ent purging or flu~hing, mechanical purging su~h as with a rod optionally fitt~d with a surrounding scr~per, or a combination o these approaches in order to obtain plural component foam dispensing apparatus with sufficiently long operating times before reguir~ng cleaning or replacement of internally clogged components. Typical e~amples of devices utilizing such systems include those disclosed in U.S. Patent Nos. 3,263,928; 4,377,256; ~,469,251;
4,534,802; 4,568,003 and 4,867,346. Howeve~, these devices do not always yield the desired length of operating time without internal clogging with cured foam or utilize undesirable solvent to obtain the reguired and desired operating time.
~ ecent approaches have incorporated the concept of keeping the flow of plural polyurethane foam components separate with:ln the dispenser until the streams enter a separate mi~cing ch~mber to pre~ent the reactive impingement mi~fing Of the o~m components f rom occurring within the dispenser and ~::logging the internal f low passages within the apparatus with cuxed 5 or set ~oam. U.S. Pat~snt No. 4"913,317 disclo~;es one ~ppar~tus ~hat h~s taken such an approach with the use of a ce~tral plug. However, thi~ approach still h~s the pot~tial or clogging :;inc~ it uses a compressed g~s purge thst has proven i.ne ective in the past to preve~t the buildup of fo~m without the use of a solvent.
Additionally the use of an aqueous medium to flush a dispe~ing app~ratus heretofore has no~ been ~ucc~ssul bec~use r~3idual water re~cts with the isocy~nate component and dama~e~ the u~it.
These proble~s are solved in the design of the pres~nt invention by providing an improved insert within a plural compon~nt dispe~sin~ apparatus that serves to separat~ the ~low streams of plural uretha~e ~ foam compone~ts and permits thP 10w o wat~r through separate ports in the insert to ~lush from the dispensing apparatus any residual compone~ts or reac~ed components that haYe formed ur@thane foam.
It is an object of the present invention to provide an improved insert in a plural component polyurethane foam dispenser that separates the component flow streams and permits flushing of the dispenser with an aqueous medium.
It is another object of the present invention to pro~ide an improved solventless plural component polyurethane ~oam componsnt dispenser that c~n operate for long periods of time without clogging.
It is a feature of the present invention that the improved chemical flow stream separator employg 20~2~27 separate passages for the ~low of an aqueous rnedium for each plural component to permit the flushing of the apparatus after use.
It is another feature of thle present invention that S each separate aqueous medlum flbw passage feeds into a corresponding plural compo~ent flow passage to flush the polyurethane flow Component ~low passages a~ter u~e.
It is still ano~her feature of the present in~ention that a compressed ~ir infeed is provided into each aqueous flush flow passa~e to dry any re~idual water remaining in the passages after flushing.
It is yet another featur~ of the pre~ent invention that the chemical 10w ~tream sap~rator and the mi~ing chamber are an integral component that is disposable.
It is an advant~ge of the present invention that a low cost and reliable solventless foam dispenser is obtained.
It iS another advantage of the present invention that the improved ~hemical flow stream separ~tor is simple ~n design and easily replaceable.
It is further ad~antage of the pr~sent invention that a well miged urethane foam is obtained at low pressure operatio~ by the use of the chemical flow stream separator.
It is yet another advantage of the present invention that the handling of hazardous solvent chemicals is avoided by the use of the improved chemical flow stream separator.
It is still another advantage of the present invention that a well mixed urethane foam is obtained by the use of the improved chemical flow stream separator in a foam dispenser that does not utilize solvent for cleaning.
These and other objects, features and inventions are obtained in the improved polyurethane foam plural component flow stream separator of the present - ~92~7 invention employed in conjunction with a foam dispensing apparatus whe:rein an easily removable insert is provided in the foam dispenser blvck with separate plural component f low passages that are separate unti 1 ~he f low of co~porle~ts is joined in a ~inqvle stream within an integral misinS~ chamber . I:ach plur~ 1 component 10w passage has a corre~pon~ling f lush passage th~t del;vers an ~ueo~ f lu~hing medium to the plur~l compoDent f low pas5ages af t~r u~e to clean ~ny residual fo~m compotlents or mi:Iced oam f rc1m the internal passageways of the disperl~er.
The adv~ntages of this inYen'cio~ will ~ecome apparent upon consid0r~tion of the ollowialg d~tai 1~
d~scription of the inverltion, especially when it is tal~en :1n conjunction witb the accompanying drawings wherea~:
Fig. 1 is a perspectiYe view of a oam dispensing apparatus employing the improved chemical f low stream separator of the present invention;
Fig. 2 i~ a bottom plan view of th~ improYed chemical f low stream separator of the pre~nt invention showing the separator inserted within ~he gurl blork of the dispenser;
Fig. 3 is a side eleva'cional view of the improved chemical flc~w stream separator o the present invention inserted within the gurl block of Figure 2 showing the aqueous medium flush activatil~ lever; and Fig. 4 is a rear ele~rational view of the improved chemieal f low stream separator of the present invention ~howing the water f lush irllets through which the flushing aqueous medium initially enters the s~parator.
Figure 1 shows in a perspectiv~ view the f oam dispen~er, indic:ated generally by the numeral 10. As seen in thi.s view, dispenser 10 has a gun manifold or block 11 w;th a nozzle to which is attached a static ~ ~3 ~ 2 7 6~
mixer (not shown). A pneumatic cylindler 12 is shown attached to the rear of the gun b10ck 11. ~n electri.c solenoid va1ve 14 connects to the cy1inder 12 to control the flow of pr,essurized air to the cylinder 12, S whose piston (not shown) drive~ the raick 15 of the rotary gear va1ve assembly 16 to turn the gears li8 to control the synchronous flow of plura7 compon~nts into the improved chemical flow s~parator ~not shown) ~ithin the gun bloi~k 11. An e1ectric trigger (not shown) is connected to 3 handle 17 to control the f10w of air into the cy1inder 1~ an~, henc~eO the f10w of plural compo~ents through the dispenser 10.
A1so seen in ~igure 1 is the isocyanate ~ side feie~
line 19 with couplings 56 and the po1yo1 ~ side feed line 20 with coup1ings 58 (partially ~isible). An air supply line 21 is shown to the rear of the manifold 11 with connections eeding the so1enoid va1ve 14 and the drying air P~ed line 22 from air li~e 59 and the three way pipe tee or coupling 2~, resp~ctively. Thle solenoid va1ve, upon ~ctivatio~ by the e1ectric trigger (not shown~, permits pressuriz~d gas to flow rom the air feed pipe tee 23 to th~ cylinder 12 to cause movement of the piston within ~ylinder 12 to thereby control the moveme~t of the rack 15 and the rotation of the rotary gear va1ve assemb1y 16. As the rack 15 synchronous1y causes the gears 18 of gear valve assembly 16 to rotatie, the flow of the isocyanate and po1yo1 compon~nts into the ch,emical f10w s~parator 2B
of FIG. 2 is controlled through the rotary va1ves 25 and 26 into inlet orifices 29 and 31 in opposing sides of the separator 28. When the rot,ry va1ves 25 and 26 are in the opien position for the flow of the plural components, the isocyanate component flows from the feed line 19 into the isocyanate interna1 passage 30 and the polyol component f10ws from the feed line 20 into the polyol internal passage 32 within the separator 28.
_7_ ~V~2~27 The air supply line 21 di~fides at air feed pipe tee 23 to supply pre~surized gas to the previously described cylinder 12 and solenoid valve 14 and on demand to feed through control valve 39 in'co the rear 5 of manifold or ~un block 11 tia coupling Z4 p~ior to fe~dline ~2. ~eedline 22 fe~d~ into a ~it~ing 35 tha~
is threadingly fastened to the back of block ll where ontinued acces~ into the b:lock ll is controlled by rotating valYe 36. Valve 36 is controlled in its l~ rotational ~ovement betwee~ open and closed positions by the rotation of lever 38 albout the mounting of scre~
61, best seen in FIGS. Z a~d 3. The lever 38 is keyed to the valve 36 and can have a washer betw~en it and the gun block 11. Valve 3~ is s~cure~ for rotational movement on its opposing side by an appropriate means, such as a snap ring, A set screw 33 can also be used with screw 61, which in combi~ation with appropriate O-ring seals, mak~s the valve chamber 39 fluid-tight.
Th0 set screw 33 i~ pl~ce~ within a tapped hole of about l~2 incb, for e~ample, so ~hat i~ i5 fully tightened within the gun block ll ~nd secured against further rotation. In he closed position valve 36 ser~es as a check valve.
Reerring again to FIGo 1~ an aqueous cleaning medium also flows into the gun block 11 via the same feedline 22 by the closing of th~ manual air control val~e 34 on air supply li~e 21 and the opening of the manual aqueous cle~ning medium control valve 40. This allows an aqueous cleaning medium, such as 50apy water, 30 to flow from th~ aqueous cleaning medium feed line 37 through the control valve 40 into the coup1ing 2~ and the f~edline 22 and then into the rear of gun block 11 through the f itting 35 . In the cleaning mode of operation~ best understood by viewing FIG. 2, the 35 aqueous cleaning medium flows first through the fitting ~n-35 and into the cl~aning passage 43 when the rot~ting valve 36 is in the open position. The medium then passes into the isocyanate and polyol internal gun block feed passages 41 and 42 via the valve 36 from where it enters the rear of the separator 2B throu~h the orifices 4~ and 45 th2t are within annular seali~g recesses 54 and 55 (see briefly ~I5. 4). Reces~es 54 and 55 a~commod3~e appr~pri~te sealing devices, surh as o-rings, conn~cting orifices ~4 and 45 to the isocyanate and polyol feed passa~es ~1 and 42 to eff~ct a li~uid-ti~hti seal ag~inst t~he separator 28. The aqueous cleaning medium then p~sses through the pass~ges 4l ~nd 42 into the internal cleaning and drying passages 46 a~d 48 of the sep~rator 28 and out through outlet port 49 in each of the recessed op~ning~
27 in the s;de or periphery of the separator ~8 adjacent the i~ocyanate infeed orifice 29 and the polyol infeed orifice 31. This permi~s the aqueous cleaning medium to clean the portion of the rot~ry valves 25 and 26 e~posed to the isocyanate and polyol infeed orifices 29 and 31, resp~ctively, and then flow back into the interior of eparator 28 through orific~s 29 and 31 into the isocyana~e ~nd polyol internal feed passages 30 and 32, respectively.
It should be noted that the isocyanate and polyol infeed orifi~es 29 and 31 are sized to the desired dispenser 10 output to control the back pr~ssure of the components upstream of the orific~s 29- and 31 to prevent premature frothing.
As is best seen in FIG. 2, internal feed passages 30 and 32 are angled from the rear to the front of the separator 28 so that they join together in a mi~ing chamber 50 at the very front of the separator 28 in a section that is of smaller diameter than the rear section of the separator 28. These separate feed passages 30 and 32 within the separator or stream 9 ~ 2 ~ 2 7 splitter 2B th~t is inserted i~to the yun block ll keeps the isocyanate A side and polyol ~ side components separated until they enter the mi~ing chamber 50 within the nozzle Sl of the separator 28.
It is at this junction in the mixin~ chamber 50 that the isocyanat~ ~nd polyol components react by impingement mising and e~it the disp~nser lO i~to the stati~ miser (not shown~ that i astened to the gun block ll by the adapter fittin~ 13 of FIG.l. Th~
combined componen~s are fur1:her mixed in the static mi~er tubular housing with :its mi~ing elements (both not shown9. A fluid-tight seal is ef~ect~d b~twee~ the static mi~er and the nozzle portion 51 with its mixing chamber 50 ~y appropriate means, such as o-ring3.
The chemical flow stream sep~rator 28 its as an insert within a hollowed-out openi~g 53 in gun block ll, partially seen in FIGS. 2 and 3, so that the entire rear portion of the separator 28 and about one ~uarter of the nozzle 51 is seated within the gun block ll.
The remaining portion of the no~zle 51 e~tends out of the ront of the gun block ll and fits within the adapter fitting 13 ~nd the static ~i~er (not shown~.
The hollowed out opening 53 is machlned out within the gun block ll and has tapered threads 52 at its f ront to ~5 secure the adapter fitting 13 and the static mi~er (not shown). An adaptor and tighten down nut (also not shown~ through which the tubular housing of the static mi~er e~tends, may be utilized to s curely fasten the static mi~er to the adaptor fitting 13 on the manifold or gun block ll.
It is to be understood that this type of a portable or on-site polyurethane foam dispenser lO is part of a foam generating system that usually comprises two storage tanks for supplying the two inter-reactiYe polyurethane-forming materials which are the isocyanate -lo - ~ ~ 9 2 ~ 2 ~
and polyol components. A gas pressl~re supQlying system is provided to pressurize these tanks to e~pel or force the reactants out therefrom through bulk flo~ supply lines that connect via the coup:lings 56 and 5a of FIG.
S 1 to the feed lines 19 a~d 20 of the dispenser 10. A
typical foam di~penser corresponding to dispen~er 10 is shown and described in V.S. Patent No. 4,073,664~
The static mi~er with its internal mi~ing elements may be of any suit~ble, such as that descrihed in U.S.
Patent No. 4,850,705.
In operati-on, the dispens~!r 10 is ~c vated by depression of the trigger switch ~not shown~ on th~
handle 17 which allows air to activate the air cylinder 12 and force the cylinder rod (not shown~ to cause the rack 15 to move the gear 18 to the open position, thereby rotating the rotary valves 25 and 26. This permits the pressurized isocyanate A component and the polyol B component to flow through the eed lines 19 and 20 into the gun ~lock 11 via the i~ocyanate and polyol in~eed oriic~s 29 and 30 in the separator 28.
The flow streams uf the isoc~anate ~ and the polyol B
components are kept separate within the separator 28 by passing through the angled isocyanate and polyol infeed passages 30 and 3~ until routed into the mi~ing chamber so within t~e nozzle 51. The isocyanate A and the polyol B components are then combined and f ed under pressure into the static mi~er tube or further mixing and dispensing a~ the finished product.
During the oam dispensing operation the manual air control flow val~e 34 and the manual ~queous cleaning medium flow control valve 40 have been in the closed positions. When it is necessary to clean the dispenser after the foam dispensing operation, the aqueous cleaning medium flow control valve 40 is opened to permit the cleaning and purging liquid medium, ~ ~ r~
preferably soapy water, to flow tnrough the aq~leous cleaning medium eed line 37 and th4 coupling 2~ i~to the gun block feedline 22. The aqueous cleaning medium then flows into the gun block 11 through the fittiny 35 and the cleanin~ passage 43. Valve 36 is opened by depre~sing lever 38 to perm:it the cleaning medium to . flow into the isocyanate ancl polyol cleaning passages 41 and 42, resp~ctively. The cleaning medium then passes into the separator 28 Yia the internal cleaning lo and drying ~assages 46 and 4IB. The cleaning medium is momentarily routed out ot the separator 28 through th~
outlet ports 99 to clean the exposed portions of the closed rotary valves ~5 and 26 and then reenters the separator 28 through the isocyanate and pslyol infeed orifices 29 and 31, respectively. The cleaning m~dium then passes through the isocyanate and polyol internal infeed pas~ages 30 a~d 32 to flush a~y residual fo m components th~refrom into the mi~ing chamber 50. The cleaning medium can then be dirested through the static mi~er, or the static mi~er csn be detached from the dispenser 10 and cleaned separately or discarded, as may be appropriate.
After the aqueous cleaning medium has completed the flushing of the dispenser 10, any r~sidual medium must be removed to preclude reaction with the foam components upon operation of the oam dispenser. This is accomplisbed by the shutting of the agueous, medium control valve 40 and the openin~ of the air control valve 3~, simultaneously with the continued d~pression of the valve lever 38, to permit drying air to follow the same route as the aqueous cleaning medium within the gun block 11 and the separator 28. The drying air, or other appropriate gas, is fed from the supply line 21 into the gun block 11 via the coupling 24 and the fitting 35.
Having thus described the invention, what is claimed is:
Claims (16)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. In a plural component dispensing apparatus 10 for the dispensing of a substance formed from the mixing and reaction of plural components that are selectively fed via flow control means into a dispensing gun block 11 in a plurality of separate plural component flow passageways 41,42 at a first end and exit the dispensing gun block at an opposing second end, comprising:
(a) a flow stream separator 28 inserted within the gun block 11 connected to the plurality of plural component flow passageways 41,42 adapted to receive the separate flow of plural components and keep them separate in separator passages 30,32, the separator passages feeding the plural components to a point of mixing 50 where they are impingement mixed and exit through an exit passageway from the separator 28, the separator 28 further having a plurality of separate liquid cleaning medium passageways 46,48 selectively controlled via second flow control means 35,37 for the selective flow of cleaning medium therethrough to remove any plural components or reacted plural components from the plurality of plural component flow passageways 41,42, the separator passageways 30,32 and the point of mixing 50 and exit passageway of the separator 28;
(b) a gas feed line connected to the plurality of separate liquid cleaning medium flow passageways 35,36 effective via third flow control means 34 to selectively dry the liquid cleaning medium flow passageways 35,36 after cleaning; and (c) liquid cleaning medium feed means 40 to deliver cleaning medium to the liquid cleaning medium passageways 43,46,48.
(a) a flow stream separator 28 inserted within the gun block 11 connected to the plurality of plural component flow passageways 41,42 adapted to receive the separate flow of plural components and keep them separate in separator passages 30,32, the separator passages feeding the plural components to a point of mixing 50 where they are impingement mixed and exit through an exit passageway from the separator 28, the separator 28 further having a plurality of separate liquid cleaning medium passageways 46,48 selectively controlled via second flow control means 35,37 for the selective flow of cleaning medium therethrough to remove any plural components or reacted plural components from the plurality of plural component flow passageways 41,42, the separator passageways 30,32 and the point of mixing 50 and exit passageway of the separator 28;
(b) a gas feed line connected to the plurality of separate liquid cleaning medium flow passageways 35,36 effective via third flow control means 34 to selectively dry the liquid cleaning medium flow passageways 35,36 after cleaning; and (c) liquid cleaning medium feed means 40 to deliver cleaning medium to the liquid cleaning medium passageways 43,46,48.
2. The dispensing apparatus 10 according to claim 1 wherein the flow stream separator 28 is elongated with a rear section connected to the liquid cleaning medium flow passageways 46,48.
3. The dispensing apparatus 10 according to claim 2 wherein the flow stream separator 28 further has a mixing chamber 50 in which the plural components meet and are mixed and react, the flow stream separator 28 further having a periphery on the rear section connected to the plural component flow passageways 41,42 of the gun block 11.
4. The dispensing apparatus 10 according to claim 3 wherein the flow control means that selectively feed the plural components into the gun block 11 further comprise separate valve means 25,26 for each component, the valve means 25,26 being mounted to the dispensing apparatus 10 adjacent the gun block 11 and connected to a corresponding separate plural component flow passageway 30,32.
5. The dispensing apparatus 10 according to claim 4 characterized in that the liquid cleaning medium flow passageways 46,48 exit the periphery of the separator 28 adjacent the valve means 25,26 and the plural component flow passageways 30,32 so as to convey the liquid cleaning medium to clean the valve means 25,26 and then enter and clean the plural component flow passageways 30, 32.
6. The dispensing apparatus 10 according to claim 5 wherein the gas feed line 21 further has a valve 34 to selectively control the flow of gas therethrough into the plurality of liquid cleaning medium passageways 46,48 and the plurality of plural component flow passageways 30,32 to dry the liquid within the separator 28.
7. The dispensing apparatus 10 according to claim 6 wherein the second flow control means 25,26 further comprises a rotary valve 40 that controls the flow of cleaning medium into the dispensing gun block 11.
8. The dispensing apparatus 10 according to claim 7 characterized in that the liquid cleaning medium and the drying gas enter the dispensing gun block 11 through the same shared feed line 22.
9. The dispensing apparatus 10 according to claim 8 characterized in that the flow stream separator 28 further has a front section connected to the rear section within which is contained the mixing chamber 50 and which defines a nozzle 51 that is smaller in periphery than the rear section.
10. A chemical flow stream separator 28 adapted for insertion into a plural component dispensing apparatus 10 for the dispensing of mixed and reacted plural components, comprising in combination:
(a) an elongated front section 51 having a first periphery with a first end and an opposing second end;
(b) at least two plural component feed passageways 30,31 within the elongated front section 51;
(c) a mixing chamber 50 formed by the junction of the plural component feed passageways 30,32 and having an orifice on the first end of the elongated front section to permit mixed and reacted plural components to exit therethrough; and (d) an elongated rear section connected to the opposing second end of the elongated front section 51 on a front end, the rear section having an opposing rear end defining between the front end and the rear end a second periphery, the rear section further having a plurality of passageways 46,48 therein, at least a portion of the passageways 46,48 being utilized to transport a liquid cleaning medium and a drying gas therethrough and connected at a common entrance, the passageways 46,48 having openings 27 in the second periphery to permit the exit of the liquid cleaning medium and the drying gas from the portion of passageways 46,48 used to transport the liquid cleaning and drying medium from the common entrance and a second set of openings 29,31 in the second periphery connecting to the plural component feed passageways 30,31 to selectively permit the passage of plural components through the plural component feed passageways 30,31 and the subsequent passage of liquid cleaning medium and drying gas through the plurality of passageways 46,43 and the plural component feed passageways 30,31 and the mixing chamber 50 and orifice 51 to permit cleaning and drying of the separator 28 .
(a) an elongated front section 51 having a first periphery with a first end and an opposing second end;
(b) at least two plural component feed passageways 30,31 within the elongated front section 51;
(c) a mixing chamber 50 formed by the junction of the plural component feed passageways 30,32 and having an orifice on the first end of the elongated front section to permit mixed and reacted plural components to exit therethrough; and (d) an elongated rear section connected to the opposing second end of the elongated front section 51 on a front end, the rear section having an opposing rear end defining between the front end and the rear end a second periphery, the rear section further having a plurality of passageways 46,48 therein, at least a portion of the passageways 46,48 being utilized to transport a liquid cleaning medium and a drying gas therethrough and connected at a common entrance, the passageways 46,48 having openings 27 in the second periphery to permit the exit of the liquid cleaning medium and the drying gas from the portion of passageways 46,48 used to transport the liquid cleaning and drying medium from the common entrance and a second set of openings 29,31 in the second periphery connecting to the plural component feed passageways 30,31 to selectively permit the passage of plural components through the plural component feed passageways 30,31 and the subsequent passage of liquid cleaning medium and drying gas through the plurality of passageways 46,43 and the plural component feed passageways 30,31 and the mixing chamber 50 and orifice 51 to permit cleaning and drying of the separator 28 .
11. The separator 28 according to claim 11 wherein the front section 51 is generally cylindrical in shape, the first periphery being smaller than the second periphery of the rear section.
12. The separator 28 according to claim 11 characterized in that the rear section is generally cylindrical in shape.
13. A method of operating a plural component foam dispenser characterized by the steps of:
(a) feeding the plural components in separate flow streams into plural component f low stream passageways within a flow stream separator within the dispenser;
(b) mixing and reacting the separate plural component flow streams in a mixing chamber within the flow stream separator;
(c) ejecting the mixed and reacted plural components from the mixing chamber;
(d) feeding an aqueous cleaning medium into the plural component flow stream passageways within the flow stream separator and the mixing chamber to remove residual plural components and reacted plural components; and (e) directing a drying gas flow stream along the same flow path as the aqueous cleaning medium to dry any liquid remaining in the plural component flow stream passageways and the mixing chamber within the separator to prevent the reaction of the plural components and the aqueous cleaning medium upon resumption of the mixing and reaction process.
(a) feeding the plural components in separate flow streams into plural component f low stream passageways within a flow stream separator within the dispenser;
(b) mixing and reacting the separate plural component flow streams in a mixing chamber within the flow stream separator;
(c) ejecting the mixed and reacted plural components from the mixing chamber;
(d) feeding an aqueous cleaning medium into the plural component flow stream passageways within the flow stream separator and the mixing chamber to remove residual plural components and reacted plural components; and (e) directing a drying gas flow stream along the same flow path as the aqueous cleaning medium to dry any liquid remaining in the plural component flow stream passageways and the mixing chamber within the separator to prevent the reaction of the plural components and the aqueous cleaning medium upon resumption of the mixing and reaction process.
14. The method according to claim 13 further characterized by using soapy water as the aqueous cleaning medium.
15. The method according to claim 14 further characterized by using polyol and isocyanate as the plural components.
16. The method according to claim 15 further characterized by using air as the drying gas.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US588,111 | 1990-09-25 | ||
| US07/588,111 US5086949A (en) | 1990-09-25 | 1990-09-25 | Chemical flow stream separator |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2092427A1 true CA2092427A1 (en) | 1992-03-26 |
Family
ID=24352528
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002092427A Abandoned CA2092427A1 (en) | 1990-09-25 | 1991-08-26 | Chemical flow stream separator |
Country Status (7)
| Country | Link |
|---|---|
| US (1) | US5086949A (en) |
| EP (1) | EP0550594A4 (en) |
| JP (1) | JPH06501656A (en) |
| AU (1) | AU8630291A (en) |
| BR (1) | BR9106877A (en) |
| CA (1) | CA2092427A1 (en) |
| WO (1) | WO1992005105A1 (en) |
Families Citing this family (21)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5530988A (en) * | 1992-06-19 | 1996-07-02 | Mcquillan; Raymond | Device for clearing pipes or other lines with pressurized gas |
| US5423488A (en) * | 1994-05-11 | 1995-06-13 | Davidson Textron Inc. | Spray apparatus for mixing, atomizing and spraying foam forming components |
| US5462207A (en) * | 1994-10-19 | 1995-10-31 | Ocg Microelectronic Materials, Inc. | Environmentally safe dispensing assembly for ultra-pure liquid chemicals |
| US5562883A (en) * | 1995-05-05 | 1996-10-08 | Davidson Textron Inc. | Solvent flush reaction injection molding mixhead |
| US5799876A (en) * | 1995-05-31 | 1998-09-01 | Martin Marietta | External mixed plural component spray gun |
| US6227228B1 (en) | 1996-08-02 | 2001-05-08 | Graco Minnesota Inc. | Purge process for sequential plural component mixing system |
| US6315161B1 (en) * | 1998-02-10 | 2001-11-13 | Jesco Products Company, Inc. | Method and apparatus for applying a foamable resin |
| KR100582617B1 (en) * | 1998-11-05 | 2006-05-23 | 그라코 인크. | Orbital dispenser for application of viscous material |
| US7055650B2 (en) * | 2001-05-17 | 2006-06-06 | Jlg Industries, Inc. | Saw accessory for aerial work platform |
| US6811059B2 (en) * | 2003-02-24 | 2004-11-02 | Sealed Air Corporation (Us) | Self-cleaning fluid dispenser |
| US20050218556A1 (en) * | 2004-04-02 | 2005-10-06 | Lear Corporation | Method and apparatus for spray forming polyurethane skins with a hydraulic mixing head |
| EP1763404A1 (en) * | 2004-07-08 | 2007-03-21 | Mixpac Systems AG | Dispensing system comprising a syringe or cartridge and a mixer |
| US8511047B2 (en) * | 2007-08-07 | 2013-08-20 | Sealed Air Corporation (Us) | Device for mixing and dispensing fluids |
| US8276611B2 (en) * | 2008-09-12 | 2012-10-02 | Basf Corporation | Externally adjustable pressure compensated flow control valve |
| US8123081B2 (en) * | 2008-09-12 | 2012-02-28 | Basf Corporation | Two component foam dispensing apparatus |
| US8118052B2 (en) * | 2008-09-12 | 2012-02-21 | Basf Corporation | Method of forming a polyurethane foam |
| US10220397B2 (en) * | 2009-11-23 | 2019-03-05 | Basf Se | Foam dispensing apparatus |
| US9174362B2 (en) | 2011-07-12 | 2015-11-03 | Castagra Products, Inc. | Solvent-free plural component spraying system and method |
| US9242267B2 (en) | 2013-01-31 | 2016-01-26 | Owens Corning Intellectual Capital, Llc | Method and apparatus for mixing and applying material |
| WO2020086977A1 (en) | 2018-10-26 | 2020-04-30 | Graco Minnesota Inc. | Fluid cartridge for a plural component sprayer |
| CA3200485A1 (en) * | 2020-12-04 | 2022-06-30 | Christopher J. Pellin | Stationary mix chamber |
Family Cites Families (20)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3146950A (en) * | 1961-12-22 | 1964-09-01 | William K Lancaster | Spraying apparatus |
| US3263928A (en) * | 1964-11-19 | 1966-08-02 | Frederick E Gusmer | Apparatus for ejecting a mixture of liquids |
| US3393872A (en) * | 1966-12-28 | 1968-07-23 | Roy S. Rankin | Reciprocating nozzle cleaner |
| US3690557A (en) * | 1971-07-29 | 1972-09-12 | James H Higgins | Plastic foam spray gun with substantially instantaneous cleaning feature |
| US4117551A (en) * | 1974-05-30 | 1978-09-26 | William R. Brooks | Purgeable dispensing gun for polyurethane foam and the like |
| US3941355A (en) * | 1974-06-12 | 1976-03-02 | The United States Of America As Represented By The Administrator Of The National Aeronautics And Space Administration | Mixing insert for foam dispensing apparatus |
| US4060572A (en) * | 1974-07-31 | 1977-11-29 | Borden Products Limited | Foaming apparatus |
| US4003501A (en) * | 1975-03-12 | 1977-01-18 | Mcneil Corporation | Fluid impingement mixing apparatus |
| US4129231A (en) * | 1975-11-13 | 1978-12-12 | Jeddeloh Bros. Sweed Mills, Inc. | Portable, hand-held gun for dispensing multiple fluidic components to a mixer |
| US4073664A (en) * | 1976-02-09 | 1978-02-14 | Olin Corporation | Automatically controlled cleaning fluid circuit for a foam generating apparatus and method |
| BR7907388A (en) * | 1978-11-14 | 1980-08-05 | Gema Ag | ATOMIZER PROCESS AND DEVICE ESPECIALLY FOR OBJECT COATING WITH ATOMIZED PO |
| US4377256A (en) * | 1981-06-22 | 1983-03-22 | Gusmer Corporation | Apparatus for dispensing a mixture of mutually reactive liquids |
| US4469251A (en) * | 1981-09-02 | 1984-09-04 | Sealed Air Corporation | Detachable mixing chamber for a fluid dispensing apparatus |
| US4568003A (en) * | 1981-09-02 | 1986-02-04 | Sealed Air Corporation | Detachable mixing chamber for a fluid dispensing apparatus |
| US4534802A (en) * | 1982-03-03 | 1985-08-13 | Olin Corporation | Air purge/solvent bath method |
| US4867346A (en) * | 1987-09-28 | 1989-09-19 | International Packaging Systems Incorporated | Dispenser for reactive chemicals |
| US4850705A (en) * | 1987-11-18 | 1989-07-25 | Horner Terry A | Motionless mixers and baffles |
| US4913317A (en) * | 1988-09-14 | 1990-04-03 | Foamtek, Inc. | Foam dispensing apparatus |
| US4923522A (en) * | 1989-01-19 | 1990-05-08 | Bsd Enterprises, Inc. | Method and device for cleaning a spray gun assembly |
| CA2043522A1 (en) * | 1990-06-01 | 1991-12-02 | Steven A. Wernicke | Method of cleaning urethane foam dispensor using heated water |
-
1990
- 1990-09-25 US US07/588,111 patent/US5086949A/en not_active Expired - Fee Related
-
1991
- 1991-08-26 AU AU86302/91A patent/AU8630291A/en not_active Abandoned
- 1991-08-26 CA CA002092427A patent/CA2092427A1/en not_active Abandoned
- 1991-08-26 BR BR919106877A patent/BR9106877A/en not_active Application Discontinuation
- 1991-08-26 JP JP3516039A patent/JPH06501656A/en active Pending
- 1991-08-26 WO PCT/US1991/006072 patent/WO1992005105A1/en not_active Application Discontinuation
- 1991-08-26 EP EP19910917425 patent/EP0550594A4/en not_active Withdrawn
Also Published As
| Publication number | Publication date |
|---|---|
| WO1992005105A1 (en) | 1992-04-02 |
| US5086949A (en) | 1992-02-11 |
| EP0550594A4 (en) | 1993-12-08 |
| EP0550594A1 (en) | 1993-07-14 |
| AU8630291A (en) | 1992-04-15 |
| BR9106877A (en) | 1993-07-06 |
| JPH06501656A (en) | 1994-02-24 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| FZDE | Discontinued |